Good luck - and let us know how you did in the comments!

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We already know that the majority of humans are right-handed, and it turns out that dolphins are too! Yes, we know they don't have hands...but bear with us. Some new research shows that they have a ...

© 2025 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.

© 2026 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.

© 2025 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.

Think you're a bit of a quiz whizz? Then test your knowledge with these tough questions - will you score top marks or be left at the bottom of the class?